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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdca4d3efa8b73f70074018c049f4198f3c249b59f076e5463f4a76d9ee40db3' 
  AND token = '9+prGtCRdXsfOMx9ul0Mr2bgkB79jDGx1pDx3tfzmHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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