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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0077c592937fcd30de0c040287ee8c09bda0cd0cb4752932b9a56b26175f220b' 
  AND token = 'kp091GNdmBhsS5gsAjT5HnzARB/KQFi8fhF1YWyvfI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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