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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97522d6a8ed5aa8ce4df40160ed8e0a09495a2dff527b0fd16287034dd67f142' 
  AND token = 'HVTu1R7pV3NogVwxG8oR12i9bQEftosUxx6+Em+XaXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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