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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19929d5e1393b2291c0ee23cd93e97bc34221338edb923350941e72c10e55e25' 
  AND token = 'NO3oNxbtQVCgiZxsCF8LOYRHjH1nmH1I7Q9UXEk/5SQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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