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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fffc7cea98ab15b6e8834e2fdf9fba16a05a9eeb3097d7b569e6648bcdd88afb' 
  AND token = 'CWn6mEWaUwlHw6a9bt0jrdnNNq4iPI4Eih6h0PY6nwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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