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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70c41c4b25b06d58155ddd71c37a4904a32b9bdfc0f0ba0c4b3d604b4da42a41' 
  AND token = '8TFC003JhajkQVkCEu8wBBnAifBLGzdBQlkcWJu7w4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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