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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f31d17d70ed37c80eaa0a04abdf0ae9d5ccd2de78211d1dd9bb561cc6b41bc2' 
  AND token = '3IyQcW/Ce+zW+Raw9ueF8IwduxPP7x761MTQYbwtlgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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