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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca4c24ae907c6bf9bffed985ca0d8c1bcc900c981d92e7a0e7eb9e41c1ff9b5f' 
  AND token = 'MtPKA5R0yWJdRFQ7Ev5PM+lG3VB+s/xWIiKOKBQSja0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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