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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec8374513bc70416aaa91bbeda4eb80edb38197a07299995d7634104582e10d9' 
  AND token = 'cDC+PzdkMQBbQRfikUP0CZ+4vGdWv4CPiEE5WbswP80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.07696

JSON explain

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