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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01a5dc848456f4d850d632f78a1f8ac3be4ada2841b73f220e1759803eb87e78' 
  AND token = 'MGorl0Kdv27fmer9knKm/9Ln0tJGhq8aY/OJG9elAoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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