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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6da867d183b5a1d7c3ae7258df14064253a9adad1b276aea3bb70313fd46430' 
  AND token = 'Q7e2btXmsB1FKJJZQSJ0Rd3IImg6RrgTvEOAJAi9yEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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