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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2b87c5edb3ca33d53c9aaf68247a6bdeca318618af0f2756f180d204bfb32b0' 
  AND token = 'NcZv6vBm3T/aZLdRBBHTf0t5mzGdn5dQUSUcR5UUyRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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