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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a39615d2001c2fe790808459828af8c87f2a8b9135af7a6f9e63461249ac4231' 
  AND token = 'ea6Mn2OmOEG1QxoEBCXxWGIb0jJOWdVGe1l14EjBlkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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