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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85c7828b692e8db878ab3952279ca1e4f4b4e9699e406f7aca2055b9704d89b3' 
  AND token = 'BVAUQRfc01srSCen/dHJux417jpksTTJIrwdDgbEObk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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