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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04dccd394f4b5c59656325ea6a559cdaa7f8e44fde93ee917ea86dac1092fba8' 
  AND token = 'ik7sy1pm9YIy+SUana4Yn6vYlJ63E3y/XmZe1ts77dA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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