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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e33b5fc627aeef252b1d2f8874dc5171cc493e69890d0ec87952b3a846837217' 
  AND token = 'DwXZu7DrYHfN+nJm19qCfZkHwuRCRUr+9Rr1QLGkNLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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