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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8330c20fdb902d06e3c8f521bc9d610570a80de513fef51496ed3057bfbae089' 
  AND token = 'F9Cc8S5sv7HqWniFx2Zu9LoII5rpyQ3rd/t6aAoI/yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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