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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19a9ce58cad8c2231be851fb4f87c67eed295c24063da2adf332e16953622201' 
  AND token = 'fNdR7wSPE4+Vmi+kG2o3Rrzc4/W2eOyqJdJQI6t3gLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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