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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd30b3c355b0248d78d5bce87c11208dadcf7372d3d05cd36bb5da940b3af681' 
  AND token = 'soxAosK4Jpi1I4MKmC63BcI0ZTa7BuOHS9k8ARJOFa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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