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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f25d1105a0633038879269cbc732f9aff1a8fe2a685c9a2d05ba43437f7fde3b' 
  AND token = 'n+Y3Fii70qhgei3hhU9LR+RzpHhkZyEZCRUTYI2VrXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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