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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30a14b7e8a041a0db92582da213c49ad59a1564b3e960f0bcaefc5175c7a8e75' 
  AND token = 'wDpm7mzldwRWMrt0ZF4s86AzPcsguwL2amoWfbYsvFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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