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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '892e1701dbd21c6375892ba9fd2cef37230abb13306622d55f42a6042938a403' 
  AND token = 'd1KO+PPkusk100NX6Whzjw6Ehwrw2by+FlAmrAWkd2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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