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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46e5b27eceffe968e1374c8d678f7a15f28513b9eccc3189154d8ee871bb0e32' 
  AND token = 'SJcg4En3tHLYB45hVkVb6KviS0yX3Xn5tabZZO0E4uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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