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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9efe57164eb58f56ab20fe81754b9192a2f0e68ede234bfd67f0ba82430bfd0' 
  AND token = 'p327RyOwXRybG4PCpWkqSp52qu+2Dy8uaZI/tCjnYR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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