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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19d904c6cd34653e17a8dd8b6e3626d6ce9a75f68a18a8f828fcb84e1a276e02' 
  AND token = 'nEyrZaaMBKlT2rCcYDOyouXt7c0gP2/TPH41l7NqIa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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