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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e88c80943711602ce722be70f1407bcf487b66496ba27a397b84759d4988d6d' 
  AND token = 'QbtLqdrUf9Td/XJF8zU1NYqtvI9Y86fkLgkkOFJb/wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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