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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '731607c89b034e6f53bfcb7358132316687e93abf7ce0ca5effe0739e20094b1' 
  AND token = '4Dbmi1re7s3lfiSKJ/gn/GYJjuwKjw9tblbBlweNauw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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