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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '404a637668b028b60259f22293587cb11d97c2a9dbd9f22d72ca5f958df749de' 
  AND token = '9UI6OyjoKiIdWBUi6U+VDkFfXEJRUmenh/3KUH5MJnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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