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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a70d2b0b0db080126669fb22dfae302567f963841ac656ab88f29f852e1beb3' 
  AND token = 'LdO9qiI7LqSwIlmpvnuQAY09QNSZYlPAYJ85M4WCUB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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