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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5f4cc213c16a643f8cba03a78cc7796292966d716751535a382b20a439dd79f' 
  AND token = 'BJdi4SaUF5amN3naNxJjlGB+spFgblBCnwDnkwMURCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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