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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6abc6826845cfc563058ac99feb68e8b7802102b080368c16c8d4dde1675a600' 
  AND token = '9uJVtuvBP4j8CmRIKhqkjg+gyn9xrd7+RjHSLwUn0l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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