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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3af883be210b77f628db4736988a30bfde1b80d9bc7dfd23df7e47eb16fafa2c' 
  AND token = 'uidL9MW0igJMw/G/1VWNi8d6FkGZ3V9Gv/BN87+CZeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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