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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4f0819f7d952d570847e7905c0cc776102a40c2b2eb88dc757391b78e7deefb' 
  AND token = 'KXq8FJM2rDBeVLyhU8E7mApiK4SS4vZiM2+90Cf7Gm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}