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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbc7069ba665560c3b61966aff1f23bc304e88a9e5f692b0f910b2175ef42aff' 
  AND token = 'NY6YsfqXmy0+AVxHpuEH0KmY1AGEi8NiCob7hMnr5TI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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