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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4796b41e9e18a17f2de1452b53b331a68500bcc06054d5a4992a9691a54a296c' 
  AND token = 'fNyf6Uun+Stgr6mgWuJ9aJuRepAzSPcmFO+lAo0TO/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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