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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b445d29fd5e6f8c77503d5884f82cf9bab4b68d846dadc8375bd020ff45171a8' 
  AND token = 'LqHlCddD/VDT/VClLEQMis8x0YQSwik7k31pyWGTne0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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