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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc2816094e1f9c843614289485412c36c365dab36ceee5e00bf2350e32d92c9f' 
  AND token = 'lb97pNrey2Bg+UNk6tx9HeUKvKIPi1V+ePAzGzRBVWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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