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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9d23bc5b72d9e9bc352c79ccdddfd68d2544e07e7920b4060232321b3cd97ba' 
  AND token = '/cxdLn853BJ8Z3yDxjoWpaSSTVyDnpLcMAmrpfglaP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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