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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '638341e41e7da91f555f0d8a4bfb70ac5373ffb233d909eff930088a6ef085df' 
  AND token = 'sA5oetwQ2rJRyTrlMLXDyfWzhQZaEyBkAwEp1xCBOXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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