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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88bca84ce681f0032a36c351422d644e979c866cf28d0736acd6af23f886ef2c' 
  AND token = 'dBAqyliuw7KPGO3ch/DJCVuG+GMAf2VkLe4XKeX+WSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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