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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7039a4a557e96f888b783904b773fc69106224e84ad6920e7d6a44e83c4330a' 
  AND token = 'Kb19yqzH8OIIB9zdOLX9RaOy3d1dWgGRR6gP6WvSWiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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