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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bfc2367b2219b896d5d2a69b298cfb96dcae685e29e3cf3df44c4444b9d4db5' 
  AND token = 'iKavUBOfwTwyWWCZpLri+9S4J5Mbi8Nrbcq9wa6x/oA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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