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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ae1e0715247e334090e6b2c41c44c83e8d030ffdcad516c22cd9520e5318304' 
  AND token = 'SEq/r5zJycUlVUBya1ZpQ2Gp+Sy6iR4M+PwuTWbxXug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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