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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d58574ee1ff86b3fe302579054aa0e6fbd4edd5e2ccbda0fdd956150ddfb397' 
  AND token = 'WQwlluV7+6PllIHkmx1ed6FSdUt7bKG5gqi2SMkq5Us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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