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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf8eb9add6fb9fde12189fcba220e2ee26a1126cdc76f674c8a5dd3b035be61c' 
  AND token = '78F5zlygE8ZH76yR6BHJT4t+5TBjxqunUPHExNZrwng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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