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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b73ad28f5cd472f24e2c052c9752762049572422f92cded7a6b507edbee42f2' 
  AND token = 'M45TWaMrMgBf7SwIdkUk840jNnG8DuVc1FCda/EgQGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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