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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d3506bd9413cea6fd83c70ff7b8390d383ed216ba768d633f038cca2e5b8f59' 
  AND token = '83cLrsC0veYh0DZscaVEVV0zg+6fTP1/sd89bZqH7Po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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