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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e34327e4ed20b3579026683f835ac332ffbe2869bf7c402234614e18801d96ea' 
  AND token = 'fkqzlrukeV2VeeWCj8BI1+WDMaIQhKRS1u9qKd4Y7J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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