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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd7286975f407207c15c0732eb6ceb5889642b7b5986a2ddc976fc5b7811c4f4' 
  AND token = 'Vzwm0ldCSgMN1TNLHhc3Jk/qJrUcqky9ofBfhzNzi38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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