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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddbc5e96aa94cd6808413e579694385ac932395d9b84bb9b95e1c07f80578b84' 
  AND token = 'OT/QcPAtfGqA2GpsMkmapvAMYoJ9Zb6k5loBpJHyibY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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