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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4efb19096387d480b011841f9d73daaf2dc0ff5f35af5a0ab89fb40c78e87b0b' 
  AND token = 'c71g9if5ucgouhz6EaPrxZ74KlxEJ2ip5Xi4nyw2a4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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