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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f74b87d9576338bddf6c6dd7ab443e4c75fc515d958393d89e19a7fa1ab59b0' 
  AND token = 'us7LJr6be7vBpP4vV4EiDG6iQ2PCIYB0vmLbzvDhfDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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