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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93cbb0e56ebd7cbb29edc0e70f68c059e7fb1c9335b86d7df2c577f024447e34' 
  AND token = '6c3Wn0sPDAInI0ZiZKG3BnAWFu6RfJq1CZmN7P0j0vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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