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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa43c77aed4652d82dc743b249201eecfdc5ff4b73d122e4a8c2af55f471bf80' 
  AND token = '6BrzZ7eySu+CSImiZyb/SE1l+RSgBEUsplxBNlNpM1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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