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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1c3c1ab16f1e9542fcb165fe830023d17e045509db8b1cd29113b8122ed7d69' 
  AND token = 'X4F9gkevuhIe6AxlfUHbKnl2Wc0jym06o+gdJP9k/Ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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