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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0b71db3506a34d1b3bb45b054a367964b52ba28b9526d32fad2f3bfa3915c80' 
  AND token = '0Yn0ZBhmLICK7axxsMwdHJ45pYbV8xZBypyPvwDfP84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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