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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06b57f8496230574d56dcd59a2e687bcd5443d9791733f34efc996ae393265df' 
  AND token = 'K07trkaZEF1ZddLolmD+Z0Gr5NXe3yAHp7HRwiBT5y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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