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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39a9e2ad700efa8e810057ab602616ddf19cdd10d8ef67f02c5056100b449acc' 
  AND token = 'v5S5NXodLIK7Uo/M1BZbOeiMLQHyhm2xzjOM4fuQxoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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