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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e783818ee5f3a930c01d8cdb7a6f4f572e4e2dd93eb4fa1176b53b7a0415fdaa' 
  AND token = 'llLRUMQBwxl2Gnni88uvTeBvkCgiWy2CEwYvokwDqtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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